connecting concrete slab foundation with pier and grade beam foundation

ptr0 · Sep 25, 2023

Hello,

The current residential house uses continuous footing/stemming wall for the perimeter, and uses pier and grade beams inside the continuous footing. Can a new attached addition being built on a monolithic concrete slab foundation? Or this new attached addition has to use the same foundation as the existing home? Btw, the soil report says the soil is highly expansive with a Plasticity Index of 27. Any thoughts will be greatly appreciated!

geotechguy1 · Sep 25, 2023

Is a slab a good choice on highly expansive soil?

MTNClimber · Sep 25, 2023

Sounds like you have a soils report. What does it say for a recommended foundation type?

If you have good performance of the existing structure, match watch is there. Putting a slab foundation on highly expansive soil is asking for trouble.

JAE · Sep 25, 2023

Don't attach two parts of a building which are on different foundations - especially in an expansive clay situation.

Either match the foundation types or provide a good building expansion joint to separate the two structures.

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connecting concrete slab foundation with pier and grade beam foundation

ptr0

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